What experimental property directly correlates with the strength of the intermolecular forces?

One experimental property directly related to the strength of intermolecular forces is the boiling point of a substance.

In the liquid state, the intermolecular forces play a large role in the behavior of the substance. If the boiling point is low, this indicates weak forces such as Van der Waal's forces. On the other hand, a high boiling point indicates strong intermolecular forces such as hydrogen bonds.

The answer for this question is d. none of these